Malicious PDF — malware analysis report

Static analysis result for SHA-256 341c6c070b64c8f9…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 08:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 980ec8e103896102e72a84ae495186c5 SHA-1: 49e4bf83cb8be39ce6cb9658b8cf89334fcbb1a5 SHA-256: 341c6c070b64c8f95b5a3cb2c7fb61be041cc2dde8453d40446720c082fbdeff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URIs, many of which point to disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics suggest this document is part of a phishing campaign or a malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=7+month+old+baby+crawling PDF link annotation
    • http://z-sinpro.com/upload/files/15971363377.pdfIn PDF document text
    • http://riph.pl/userfiles/file/kubedem.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/legazuzazemereku.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/visesobe.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/papowalivozavifitijuzi.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/pufivejodepupurimoxif.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/44836815608.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c198355383---kuzagukexasufamagigizul.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/59508350226.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/32329531056.pdfIn PDF document text
    • https://cronos.jptecnicascr.com/yiicms/ckfinder/userfiles/files/8708196981.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/24576210324.pdfIn PDF document text
    • http://www.pvvc.cz/files/70678583961.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/gotafogusisawa.pdfIn PDF document text
    • https://resicolor.com/upload/files/32864287662.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/85978269339.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/belevidamoxuf.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/20349653066149180442c31.pdfIn PDF document text
    • http://monamifrance.com/FileData/ckfinder/files/20211003_9AC880AF29A121EB.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/mivivusidivapiluxupomad.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/37189599550.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/vusixogusunudi.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/mepafelazexitupexuwire.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/78329988124.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 16676 bytes
SHA-256: 07aa4fff5ad9a1e4c83825321381642d922627b0f7d9219272ce0f89c173cb6a
font_01_sfnt_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 10812 bytes
SHA-256: 4d778cdbcdcab25a4a087c2ddc17aedf315a22e16fb823a747d1145b71598537

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